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To see what representations are available for a file you can call the GET /files/:id endpoint while requesting the representations field. 
curl https://api.box.com/2.0/files/123?fields=representations \
    -H "authorization: Bearer ACCESS_TOKEN"
The response will include a list of representations in the following format 
...
{
  "info": {
    "url": "https://api.box.com/2.0/internal_files/123/versions/345/representations/jpg_thumb_32x32"
  },
  "properties": {
      "dimensions": "32x32",
      "paged": "false",
      "thumb": "true"
  },
  "representation": "jpg"
}
...

​
Response fields

Every representation will include a set of properties and the type of representation.
  • The optional dimensions field represents the file’s dimensions in pixels as width by height.
  • The optional paged field specifies if this representation is a paged document. Some images and PDFs will often be paged documents.
  • The optional thumb field specifies if this representation is suitable as a file thumbnail.